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MAX34446
PMBus Power-Supply Data Logger
A1
A0
Table 2. PMBus/SMBus Serial-Port Address
7-BIT SLAVE
ADDRESS
Address Select
On device power-up or reset, the device samples the A0
and A1 pins to determine the PMBus/SMBus serial-port
address. See Table 2 .
100k I to V SS
100k I to V DD
100k I to V SS
100k I to V DD
100k I to V SS
100k I to V DD
0010 010 (24h)
0010 011 (26h)
0010 100 (28h)
0010 101 (2Ah)
SMBus/PMBus Operation
The device implements the PMBus command structure
using the SMBus format. The structure of the data flow
between the host and the slave is shown below for sev-
eral different types of transactions. Data is sent most
significant bit (MSB) first.
SMBus/PMBus Communication Examples
READ WORD FORMAT
1
S
7
SLAVE
ADDRESS
1
W
1
A
8
COMMAND
CODE
1
A
1
Sr
7
SLAVE
ADDRESS
1
R
1
A
8
DATA BYTE
LOW
1
A
8
DATA BYTE
HIGH
1
NA
1
P
READ BYTE FORMAT
1
S
7
SLAVE
ADDRESS
1
W
1
A
8
COMMAND
CODE
1
A
1
Sr
7
SLAVE
ADDRESS
1
R
1
A
8
DATA BYTE
1
NA
1
P
WRITE WORD FORMAT
1
S
7
SLAVE
ADDRESS
1
W
1
A
8
COMMAND
CODE
1
A
8
DATA BYTE
LOW
1
A
8
DATA BYTE
HIGH
1
A
1
P
S
W
S
W
WRITE BYTE FORMAT
1 7 1
SLAVE
ADDRESS
SEND BYTE FORMAT
1 7 1
SLAVE
ADDRESS
1
A
1
A
8
COMMAND
CODE
8
COMMAND
CODE
1
A
1
A
8
DATA BYTE
1
P
1
A
1
P
KEY:
S = START
Sr = REPEATED START
P = STOP
W = WRITE BIT (0)
R = READ BIT (1)
A = ACKNOWLEDGE (0)
NA = NOT ACKNOWLEDGE (1)
SHADED BLOCK = SLAVE TRANSACTION
Maxim Integrated
10
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